HYDRAULIC CHECK Russian patent published in 1998 - IPC

FIELD: mechanical engineering; welding equipment. SUBSTANCE: hydraulic check has first chamber in upper part of which gas-feed branch pipe is arranged, second chamber in upper part of which gas outlet branch pipe is arranged, and third chamber located between first and second chambers and connected through gas line with second chamber. All three chambers are interconnected by water lines. EFFECT: protection from back fire blast wave, reduced humidity of gas in gas outlet line. 2 dwg